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e8062719 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
e8062719 BH |
4 | * Copyright (C) 2008, 2009 |
5 | * Boaz Harrosh <bharrosh@panasas.com> | |
6 | * | |
7 | * Copyrights for code taken from ext2: | |
8 | * Copyright (C) 1992, 1993, 1994, 1995 | |
9 | * Remy Card (card@masi.ibp.fr) | |
10 | * Laboratoire MASI - Institut Blaise Pascal | |
11 | * Universite Pierre et Marie Curie (Paris VI) | |
12 | * from | |
13 | * linux/fs/minix/inode.c | |
14 | * Copyright (C) 1991, 1992 Linus Torvalds | |
15 | * | |
16 | * This file is part of exofs. | |
17 | * | |
18 | * exofs is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation. Since it is based on ext2, and the only | |
21 | * valid version of GPL for the Linux kernel is version 2, the only valid | |
22 | * version of GPL for exofs is version 2. | |
23 | * | |
24 | * exofs is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with exofs; if not, write to the Free Software | |
31 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
e8062719 BH |
35 | #include <linux/writeback.h> |
36 | #include <linux/buffer_head.h> | |
beaec07b | 37 | #include <scsi/scsi_device.h> |
e8062719 BH |
38 | |
39 | #include "exofs.h" | |
40 | ||
fe33cc1e BH |
41 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
42 | ||
06886a5a BH |
43 | enum { BIO_MAX_PAGES_KMALLOC = |
44 | (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec), | |
86093aaf BH |
45 | MAX_PAGES_KMALLOC = |
46 | PAGE_SIZE / sizeof(struct page *), | |
06886a5a BH |
47 | }; |
48 | ||
beaec07b BH |
49 | struct page_collect { |
50 | struct exofs_sb_info *sbi; | |
beaec07b BH |
51 | struct inode *inode; |
52 | unsigned expected_pages; | |
06886a5a | 53 | struct exofs_io_state *ios; |
beaec07b | 54 | |
86093aaf BH |
55 | struct page **pages; |
56 | unsigned alloc_pages; | |
beaec07b BH |
57 | unsigned nr_pages; |
58 | unsigned long length; | |
59 | loff_t pg_first; /* keep 64bit also in 32-arches */ | |
60 | }; | |
61 | ||
62 | static void _pcol_init(struct page_collect *pcol, unsigned expected_pages, | |
06886a5a | 63 | struct inode *inode) |
beaec07b BH |
64 | { |
65 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
beaec07b BH |
66 | |
67 | pcol->sbi = sbi; | |
beaec07b BH |
68 | pcol->inode = inode; |
69 | pcol->expected_pages = expected_pages; | |
70 | ||
06886a5a | 71 | pcol->ios = NULL; |
86093aaf BH |
72 | pcol->pages = NULL; |
73 | pcol->alloc_pages = 0; | |
beaec07b BH |
74 | pcol->nr_pages = 0; |
75 | pcol->length = 0; | |
76 | pcol->pg_first = -1; | |
beaec07b BH |
77 | } |
78 | ||
79 | static void _pcol_reset(struct page_collect *pcol) | |
80 | { | |
81 | pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); | |
82 | ||
86093aaf BH |
83 | pcol->pages = NULL; |
84 | pcol->alloc_pages = 0; | |
beaec07b BH |
85 | pcol->nr_pages = 0; |
86 | pcol->length = 0; | |
87 | pcol->pg_first = -1; | |
06886a5a | 88 | pcol->ios = NULL; |
beaec07b BH |
89 | |
90 | /* this is probably the end of the loop but in writes | |
91 | * it might not end here. don't be left with nothing | |
92 | */ | |
93 | if (!pcol->expected_pages) | |
86093aaf | 94 | pcol->expected_pages = MAX_PAGES_KMALLOC; |
beaec07b BH |
95 | } |
96 | ||
97 | static int pcol_try_alloc(struct page_collect *pcol) | |
98 | { | |
86093aaf BH |
99 | unsigned pages = min_t(unsigned, pcol->expected_pages, |
100 | MAX_PAGES_KMALLOC); | |
06886a5a BH |
101 | |
102 | if (!pcol->ios) { /* First time allocate io_state */ | |
45d3abcb | 103 | int ret = exofs_get_io_state(&pcol->sbi->layout, &pcol->ios); |
06886a5a BH |
104 | |
105 | if (ret) | |
106 | return ret; | |
107 | } | |
beaec07b | 108 | |
86093aaf BH |
109 | /* TODO: easily support bio chaining */ |
110 | pages = min_t(unsigned, pages, | |
111 | pcol->sbi->layout.group_width * BIO_MAX_PAGES_KMALLOC); | |
112 | ||
beaec07b | 113 | for (; pages; pages >>= 1) { |
86093aaf BH |
114 | pcol->pages = kmalloc(pages * sizeof(struct page *), |
115 | GFP_KERNEL); | |
116 | if (likely(pcol->pages)) { | |
117 | pcol->alloc_pages = pages; | |
beaec07b | 118 | return 0; |
86093aaf | 119 | } |
beaec07b BH |
120 | } |
121 | ||
86093aaf | 122 | EXOFS_ERR("Failed to kmalloc expected_pages=%u\n", |
beaec07b BH |
123 | pcol->expected_pages); |
124 | return -ENOMEM; | |
125 | } | |
126 | ||
127 | static void pcol_free(struct page_collect *pcol) | |
128 | { | |
86093aaf BH |
129 | kfree(pcol->pages); |
130 | pcol->pages = NULL; | |
06886a5a BH |
131 | |
132 | if (pcol->ios) { | |
133 | exofs_put_io_state(pcol->ios); | |
134 | pcol->ios = NULL; | |
135 | } | |
beaec07b BH |
136 | } |
137 | ||
138 | static int pcol_add_page(struct page_collect *pcol, struct page *page, | |
139 | unsigned len) | |
140 | { | |
86093aaf | 141 | if (unlikely(pcol->nr_pages >= pcol->alloc_pages)) |
beaec07b BH |
142 | return -ENOMEM; |
143 | ||
86093aaf | 144 | pcol->pages[pcol->nr_pages++] = page; |
beaec07b BH |
145 | pcol->length += len; |
146 | return 0; | |
147 | } | |
148 | ||
149 | static int update_read_page(struct page *page, int ret) | |
150 | { | |
151 | if (ret == 0) { | |
152 | /* Everything is OK */ | |
153 | SetPageUptodate(page); | |
154 | if (PageError(page)) | |
155 | ClearPageError(page); | |
156 | } else if (ret == -EFAULT) { | |
157 | /* In this case we were trying to read something that wasn't on | |
158 | * disk yet - return a page full of zeroes. This should be OK, | |
159 | * because the object should be empty (if there was a write | |
160 | * before this read, the read would be waiting with the page | |
161 | * locked */ | |
162 | clear_highpage(page); | |
163 | ||
164 | SetPageUptodate(page); | |
165 | if (PageError(page)) | |
166 | ClearPageError(page); | |
167 | ret = 0; /* recovered error */ | |
168 | EXOFS_DBGMSG("recovered read error\n"); | |
169 | } else /* Error */ | |
170 | SetPageError(page); | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | static void update_write_page(struct page *page, int ret) | |
176 | { | |
177 | if (ret) { | |
178 | mapping_set_error(page->mapping, ret); | |
179 | SetPageError(page); | |
180 | } | |
181 | end_page_writeback(page); | |
182 | } | |
183 | ||
184 | /* Called at the end of reads, to optionally unlock pages and update their | |
185 | * status. | |
186 | */ | |
06886a5a | 187 | static int __readpages_done(struct page_collect *pcol, bool do_unlock) |
beaec07b | 188 | { |
beaec07b BH |
189 | int i; |
190 | u64 resid; | |
191 | u64 good_bytes; | |
192 | u64 length = 0; | |
06886a5a | 193 | int ret = exofs_check_io(pcol->ios, &resid); |
beaec07b BH |
194 | |
195 | if (likely(!ret)) | |
196 | good_bytes = pcol->length; | |
beaec07b BH |
197 | else |
198 | good_bytes = pcol->length - resid; | |
199 | ||
34ce4e7c | 200 | EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
201 | " length=0x%lx nr_pages=%u\n", |
202 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
203 | pcol->nr_pages); | |
204 | ||
86093aaf BH |
205 | for (i = 0; i < pcol->nr_pages; i++) { |
206 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
207 | struct inode *inode = page->mapping->host; |
208 | int page_stat; | |
209 | ||
210 | if (inode != pcol->inode) | |
211 | continue; /* osd might add more pages at end */ | |
212 | ||
213 | if (likely(length < good_bytes)) | |
214 | page_stat = 0; | |
215 | else | |
216 | page_stat = ret; | |
217 | ||
fe33cc1e | 218 | EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
beaec07b BH |
219 | inode->i_ino, page->index, |
220 | page_stat ? "bad_bytes" : "good_bytes"); | |
221 | ||
222 | ret = update_read_page(page, page_stat); | |
223 | if (do_unlock) | |
224 | unlock_page(page); | |
86093aaf | 225 | length += PAGE_SIZE; |
beaec07b BH |
226 | } |
227 | ||
228 | pcol_free(pcol); | |
34ce4e7c | 229 | EXOFS_DBGMSG2("readpages_done END\n"); |
beaec07b BH |
230 | return ret; |
231 | } | |
232 | ||
233 | /* callback of async reads */ | |
06886a5a | 234 | static void readpages_done(struct exofs_io_state *ios, void *p) |
beaec07b BH |
235 | { |
236 | struct page_collect *pcol = p; | |
237 | ||
06886a5a | 238 | __readpages_done(pcol, true); |
beaec07b | 239 | atomic_dec(&pcol->sbi->s_curr_pending); |
06886a5a | 240 | kfree(pcol); |
beaec07b BH |
241 | } |
242 | ||
243 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) | |
244 | { | |
beaec07b BH |
245 | int i; |
246 | ||
86093aaf BH |
247 | for (i = 0; i < pcol->nr_pages; i++) { |
248 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
249 | |
250 | if (rw == READ) | |
251 | update_read_page(page, ret); | |
252 | else | |
253 | update_write_page(page, ret); | |
254 | ||
255 | unlock_page(page); | |
256 | } | |
beaec07b BH |
257 | } |
258 | ||
259 | static int read_exec(struct page_collect *pcol, bool is_sync) | |
260 | { | |
261 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
06886a5a | 262 | struct exofs_io_state *ios = pcol->ios; |
beaec07b | 263 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
264 | int ret; |
265 | ||
86093aaf | 266 | if (!pcol->pages) |
beaec07b BH |
267 | return 0; |
268 | ||
269 | /* see comment in _readpage() about sync reads */ | |
270 | WARN_ON(is_sync && (pcol->nr_pages != 1)); | |
271 | ||
86093aaf BH |
272 | ios->pages = pcol->pages; |
273 | ios->nr_pages = pcol->nr_pages; | |
06886a5a BH |
274 | ios->length = pcol->length; |
275 | ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT; | |
beaec07b BH |
276 | |
277 | if (is_sync) { | |
06886a5a BH |
278 | exofs_oi_read(oi, pcol->ios); |
279 | return __readpages_done(pcol, false); | |
beaec07b BH |
280 | } |
281 | ||
282 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
283 | if (!pcol_copy) { | |
284 | ret = -ENOMEM; | |
285 | goto err; | |
286 | } | |
287 | ||
288 | *pcol_copy = *pcol; | |
06886a5a BH |
289 | ios->done = readpages_done; |
290 | ios->private = pcol_copy; | |
291 | ret = exofs_oi_read(oi, ios); | |
beaec07b BH |
292 | if (unlikely(ret)) |
293 | goto err; | |
294 | ||
295 | atomic_inc(&pcol->sbi->s_curr_pending); | |
296 | ||
34ce4e7c | 297 | EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", |
06886a5a | 298 | ios->obj.id, _LLU(ios->offset), pcol->length); |
beaec07b BH |
299 | |
300 | /* pages ownership was passed to pcol_copy */ | |
301 | _pcol_reset(pcol); | |
302 | return 0; | |
303 | ||
304 | err: | |
305 | if (!is_sync) | |
306 | _unlock_pcol_pages(pcol, ret, READ); | |
06886a5a BH |
307 | |
308 | pcol_free(pcol); | |
b76a3f93 | 309 | |
beaec07b | 310 | kfree(pcol_copy); |
beaec07b BH |
311 | return ret; |
312 | } | |
313 | ||
314 | /* readpage_strip is called either directly from readpage() or by the VFS from | |
315 | * within read_cache_pages(), to add one more page to be read. It will try to | |
316 | * collect as many contiguous pages as posible. If a discontinuity is | |
317 | * encountered, or it runs out of resources, it will submit the previous segment | |
318 | * and will start a new collection. Eventually caller must submit the last | |
319 | * segment if present. | |
320 | */ | |
321 | static int readpage_strip(void *data, struct page *page) | |
322 | { | |
323 | struct page_collect *pcol = data; | |
324 | struct inode *inode = pcol->inode; | |
325 | struct exofs_i_info *oi = exofs_i(inode); | |
326 | loff_t i_size = i_size_read(inode); | |
327 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
328 | size_t len; | |
329 | int ret; | |
330 | ||
331 | /* FIXME: Just for debugging, will be removed */ | |
332 | if (PageUptodate(page)) | |
333 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, | |
334 | page->index); | |
335 | ||
336 | if (page->index < end_index) | |
337 | len = PAGE_CACHE_SIZE; | |
338 | else if (page->index == end_index) | |
339 | len = i_size & ~PAGE_CACHE_MASK; | |
340 | else | |
341 | len = 0; | |
342 | ||
343 | if (!len || !obj_created(oi)) { | |
344 | /* this will be out of bounds, or doesn't exist yet. | |
345 | * Current page is cleared and the request is split | |
346 | */ | |
347 | clear_highpage(page); | |
348 | ||
349 | SetPageUptodate(page); | |
350 | if (PageError(page)) | |
351 | ClearPageError(page); | |
352 | ||
353 | unlock_page(page); | |
354 | EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page," | |
355 | " splitting\n", inode->i_ino, page->index); | |
356 | ||
357 | return read_exec(pcol, false); | |
358 | } | |
359 | ||
360 | try_again: | |
361 | ||
362 | if (unlikely(pcol->pg_first == -1)) { | |
363 | pcol->pg_first = page->index; | |
364 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
365 | page->index)) { | |
366 | /* Discontinuity detected, split the request */ | |
367 | ret = read_exec(pcol, false); | |
368 | if (unlikely(ret)) | |
369 | goto fail; | |
370 | goto try_again; | |
371 | } | |
372 | ||
86093aaf | 373 | if (!pcol->pages) { |
beaec07b BH |
374 | ret = pcol_try_alloc(pcol); |
375 | if (unlikely(ret)) | |
376 | goto fail; | |
377 | } | |
378 | ||
379 | if (len != PAGE_CACHE_SIZE) | |
380 | zero_user(page, len, PAGE_CACHE_SIZE - len); | |
381 | ||
fe33cc1e | 382 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
383 | inode->i_ino, page->index, len); |
384 | ||
385 | ret = pcol_add_page(pcol, page, len); | |
386 | if (ret) { | |
fe33cc1e | 387 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
beaec07b BH |
388 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", |
389 | page, len, pcol->nr_pages, pcol->length); | |
390 | ||
391 | /* split the request, and start again with current page */ | |
392 | ret = read_exec(pcol, false); | |
393 | if (unlikely(ret)) | |
394 | goto fail; | |
395 | ||
396 | goto try_again; | |
397 | } | |
398 | ||
399 | return 0; | |
400 | ||
401 | fail: | |
402 | /* SetPageError(page); ??? */ | |
403 | unlock_page(page); | |
404 | return ret; | |
405 | } | |
406 | ||
407 | static int exofs_readpages(struct file *file, struct address_space *mapping, | |
408 | struct list_head *pages, unsigned nr_pages) | |
409 | { | |
410 | struct page_collect pcol; | |
411 | int ret; | |
412 | ||
413 | _pcol_init(&pcol, nr_pages, mapping->host); | |
414 | ||
415 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); | |
416 | if (ret) { | |
417 | EXOFS_ERR("read_cache_pages => %d\n", ret); | |
418 | return ret; | |
419 | } | |
420 | ||
421 | return read_exec(&pcol, false); | |
422 | } | |
423 | ||
424 | static int _readpage(struct page *page, bool is_sync) | |
425 | { | |
426 | struct page_collect pcol; | |
427 | int ret; | |
428 | ||
429 | _pcol_init(&pcol, 1, page->mapping->host); | |
430 | ||
06886a5a BH |
431 | /* readpage_strip might call read_exec(,is_sync==false) at several |
432 | * places but not if we have a single page. | |
beaec07b BH |
433 | */ |
434 | ret = readpage_strip(&pcol, page); | |
435 | if (ret) { | |
436 | EXOFS_ERR("_readpage => %d\n", ret); | |
437 | return ret; | |
438 | } | |
439 | ||
440 | return read_exec(&pcol, is_sync); | |
441 | } | |
442 | ||
443 | /* | |
444 | * We don't need the file | |
445 | */ | |
446 | static int exofs_readpage(struct file *file, struct page *page) | |
447 | { | |
448 | return _readpage(page, false); | |
449 | } | |
450 | ||
06886a5a BH |
451 | /* Callback for osd_write. All writes are asynchronous */ |
452 | static void writepages_done(struct exofs_io_state *ios, void *p) | |
beaec07b BH |
453 | { |
454 | struct page_collect *pcol = p; | |
beaec07b BH |
455 | int i; |
456 | u64 resid; | |
457 | u64 good_bytes; | |
458 | u64 length = 0; | |
06886a5a | 459 | int ret = exofs_check_io(ios, &resid); |
beaec07b | 460 | |
beaec07b BH |
461 | atomic_dec(&pcol->sbi->s_curr_pending); |
462 | ||
463 | if (likely(!ret)) | |
464 | good_bytes = pcol->length; | |
beaec07b BH |
465 | else |
466 | good_bytes = pcol->length - resid; | |
467 | ||
34ce4e7c | 468 | EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
469 | " length=0x%lx nr_pages=%u\n", |
470 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
471 | pcol->nr_pages); | |
472 | ||
86093aaf BH |
473 | for (i = 0; i < pcol->nr_pages; i++) { |
474 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
475 | struct inode *inode = page->mapping->host; |
476 | int page_stat; | |
477 | ||
478 | if (inode != pcol->inode) | |
479 | continue; /* osd might add more pages to a bio */ | |
480 | ||
481 | if (likely(length < good_bytes)) | |
482 | page_stat = 0; | |
483 | else | |
484 | page_stat = ret; | |
485 | ||
486 | update_write_page(page, page_stat); | |
487 | unlock_page(page); | |
fe33cc1e | 488 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
beaec07b BH |
489 | inode->i_ino, page->index, page_stat); |
490 | ||
86093aaf | 491 | length += PAGE_SIZE; |
beaec07b BH |
492 | } |
493 | ||
494 | pcol_free(pcol); | |
495 | kfree(pcol); | |
34ce4e7c | 496 | EXOFS_DBGMSG2("writepages_done END\n"); |
beaec07b BH |
497 | } |
498 | ||
499 | static int write_exec(struct page_collect *pcol) | |
500 | { | |
501 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
06886a5a | 502 | struct exofs_io_state *ios = pcol->ios; |
beaec07b | 503 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
504 | int ret; |
505 | ||
86093aaf | 506 | if (!pcol->pages) |
beaec07b BH |
507 | return 0; |
508 | ||
beaec07b BH |
509 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
510 | if (!pcol_copy) { | |
511 | EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n"); | |
512 | ret = -ENOMEM; | |
513 | goto err; | |
514 | } | |
515 | ||
516 | *pcol_copy = *pcol; | |
517 | ||
86093aaf BH |
518 | ios->pages = pcol_copy->pages; |
519 | ios->nr_pages = pcol_copy->nr_pages; | |
06886a5a BH |
520 | ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT; |
521 | ios->length = pcol_copy->length; | |
522 | ios->done = writepages_done; | |
523 | ios->private = pcol_copy; | |
524 | ||
525 | ret = exofs_oi_write(oi, ios); | |
beaec07b | 526 | if (unlikely(ret)) { |
06886a5a | 527 | EXOFS_ERR("write_exec: exofs_oi_write() Faild\n"); |
beaec07b BH |
528 | goto err; |
529 | } | |
530 | ||
531 | atomic_inc(&pcol->sbi->s_curr_pending); | |
34ce4e7c | 532 | EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", |
06886a5a | 533 | pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset), |
beaec07b BH |
534 | pcol->length); |
535 | /* pages ownership was passed to pcol_copy */ | |
536 | _pcol_reset(pcol); | |
537 | return 0; | |
538 | ||
539 | err: | |
540 | _unlock_pcol_pages(pcol, ret, WRITE); | |
06886a5a | 541 | pcol_free(pcol); |
beaec07b | 542 | kfree(pcol_copy); |
06886a5a | 543 | |
beaec07b BH |
544 | return ret; |
545 | } | |
546 | ||
547 | /* writepage_strip is called either directly from writepage() or by the VFS from | |
548 | * within write_cache_pages(), to add one more page to be written to storage. | |
549 | * It will try to collect as many contiguous pages as possible. If a | |
550 | * discontinuity is encountered or it runs out of resources it will submit the | |
551 | * previous segment and will start a new collection. | |
552 | * Eventually caller must submit the last segment if present. | |
553 | */ | |
554 | static int writepage_strip(struct page *page, | |
555 | struct writeback_control *wbc_unused, void *data) | |
556 | { | |
557 | struct page_collect *pcol = data; | |
558 | struct inode *inode = pcol->inode; | |
559 | struct exofs_i_info *oi = exofs_i(inode); | |
560 | loff_t i_size = i_size_read(inode); | |
561 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
562 | size_t len; | |
563 | int ret; | |
564 | ||
565 | BUG_ON(!PageLocked(page)); | |
566 | ||
567 | ret = wait_obj_created(oi); | |
568 | if (unlikely(ret)) | |
569 | goto fail; | |
570 | ||
571 | if (page->index < end_index) | |
572 | /* in this case, the page is within the limits of the file */ | |
573 | len = PAGE_CACHE_SIZE; | |
574 | else { | |
575 | len = i_size & ~PAGE_CACHE_MASK; | |
576 | ||
577 | if (page->index > end_index || !len) { | |
578 | /* in this case, the page is outside the limits | |
579 | * (truncate in progress) | |
580 | */ | |
581 | ret = write_exec(pcol); | |
582 | if (unlikely(ret)) | |
583 | goto fail; | |
584 | if (PageError(page)) | |
585 | ClearPageError(page); | |
586 | unlock_page(page); | |
06886a5a BH |
587 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
588 | "outside the limits\n", | |
589 | inode->i_ino, page->index); | |
beaec07b BH |
590 | return 0; |
591 | } | |
592 | } | |
593 | ||
594 | try_again: | |
595 | ||
596 | if (unlikely(pcol->pg_first == -1)) { | |
597 | pcol->pg_first = page->index; | |
598 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
599 | page->index)) { | |
600 | /* Discontinuity detected, split the request */ | |
601 | ret = write_exec(pcol); | |
602 | if (unlikely(ret)) | |
603 | goto fail; | |
06886a5a BH |
604 | |
605 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", | |
606 | inode->i_ino, page->index); | |
beaec07b BH |
607 | goto try_again; |
608 | } | |
609 | ||
86093aaf | 610 | if (!pcol->pages) { |
beaec07b BH |
611 | ret = pcol_try_alloc(pcol); |
612 | if (unlikely(ret)) | |
613 | goto fail; | |
614 | } | |
615 | ||
fe33cc1e | 616 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
617 | inode->i_ino, page->index, len); |
618 | ||
619 | ret = pcol_add_page(pcol, page, len); | |
620 | if (unlikely(ret)) { | |
34ce4e7c | 621 | EXOFS_DBGMSG2("Failed pcol_add_page " |
beaec07b BH |
622 | "nr_pages=%u total_length=0x%lx\n", |
623 | pcol->nr_pages, pcol->length); | |
624 | ||
625 | /* split the request, next loop will start again */ | |
626 | ret = write_exec(pcol); | |
627 | if (unlikely(ret)) { | |
628 | EXOFS_DBGMSG("write_exec faild => %d", ret); | |
629 | goto fail; | |
630 | } | |
631 | ||
632 | goto try_again; | |
633 | } | |
634 | ||
635 | BUG_ON(PageWriteback(page)); | |
636 | set_page_writeback(page); | |
637 | ||
638 | return 0; | |
639 | ||
640 | fail: | |
06886a5a BH |
641 | EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
642 | inode->i_ino, page->index, ret); | |
beaec07b BH |
643 | set_bit(AS_EIO, &page->mapping->flags); |
644 | unlock_page(page); | |
645 | return ret; | |
646 | } | |
647 | ||
648 | static int exofs_writepages(struct address_space *mapping, | |
649 | struct writeback_control *wbc) | |
650 | { | |
651 | struct page_collect pcol; | |
652 | long start, end, expected_pages; | |
653 | int ret; | |
654 | ||
655 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
656 | end = (wbc->range_end == LLONG_MAX) ? | |
657 | start + mapping->nrpages : | |
658 | wbc->range_end >> PAGE_CACHE_SHIFT; | |
659 | ||
660 | if (start || end) | |
06886a5a | 661 | expected_pages = end - start + 1; |
beaec07b BH |
662 | else |
663 | expected_pages = mapping->nrpages; | |
664 | ||
06886a5a BH |
665 | if (expected_pages < 32L) |
666 | expected_pages = 32L; | |
667 | ||
34ce4e7c | 668 | EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
06886a5a | 669 | "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
beaec07b | 670 | mapping->host->i_ino, wbc->range_start, wbc->range_end, |
06886a5a | 671 | mapping->nrpages, start, end, expected_pages); |
beaec07b BH |
672 | |
673 | _pcol_init(&pcol, expected_pages, mapping->host); | |
674 | ||
675 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
676 | if (ret) { | |
677 | EXOFS_ERR("write_cache_pages => %d\n", ret); | |
678 | return ret; | |
679 | } | |
680 | ||
681 | return write_exec(&pcol); | |
682 | } | |
683 | ||
684 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) | |
685 | { | |
686 | struct page_collect pcol; | |
687 | int ret; | |
688 | ||
689 | _pcol_init(&pcol, 1, page->mapping->host); | |
690 | ||
691 | ret = writepage_strip(page, NULL, &pcol); | |
692 | if (ret) { | |
693 | EXOFS_ERR("exofs_writepage => %d\n", ret); | |
694 | return ret; | |
695 | } | |
696 | ||
697 | return write_exec(&pcol); | |
698 | } | |
699 | ||
700 | int exofs_write_begin(struct file *file, struct address_space *mapping, | |
701 | loff_t pos, unsigned len, unsigned flags, | |
702 | struct page **pagep, void **fsdata) | |
703 | { | |
704 | int ret = 0; | |
705 | struct page *page; | |
706 | ||
707 | page = *pagep; | |
708 | if (page == NULL) { | |
709 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, | |
710 | fsdata); | |
711 | if (ret) { | |
712 | EXOFS_DBGMSG("simple_write_begin faild\n"); | |
713 | return ret; | |
714 | } | |
715 | ||
716 | page = *pagep; | |
717 | } | |
718 | ||
719 | /* read modify write */ | |
720 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
721 | ret = _readpage(page, true); | |
722 | if (ret) { | |
723 | /*SetPageError was done by _readpage. Is it ok?*/ | |
724 | unlock_page(page); | |
725 | EXOFS_DBGMSG("__readpage_filler faild\n"); | |
726 | } | |
727 | } | |
728 | ||
729 | return ret; | |
730 | } | |
731 | ||
732 | static int exofs_write_begin_export(struct file *file, | |
733 | struct address_space *mapping, | |
734 | loff_t pos, unsigned len, unsigned flags, | |
735 | struct page **pagep, void **fsdata) | |
736 | { | |
737 | *pagep = NULL; | |
738 | ||
739 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, | |
740 | fsdata); | |
741 | } | |
742 | ||
efd124b9 BH |
743 | static int exofs_write_end(struct file *file, struct address_space *mapping, |
744 | loff_t pos, unsigned len, unsigned copied, | |
745 | struct page *page, void *fsdata) | |
746 | { | |
747 | struct inode *inode = mapping->host; | |
748 | /* According to comment in simple_write_end i_mutex is held */ | |
749 | loff_t i_size = inode->i_size; | |
750 | int ret; | |
751 | ||
752 | ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata); | |
753 | if (i_size != inode->i_size) | |
754 | mark_inode_dirty(inode); | |
755 | return ret; | |
756 | } | |
757 | ||
beaec07b BH |
758 | const struct address_space_operations exofs_aops = { |
759 | .readpage = exofs_readpage, | |
760 | .readpages = exofs_readpages, | |
761 | .writepage = exofs_writepage, | |
762 | .writepages = exofs_writepages, | |
763 | .write_begin = exofs_write_begin_export, | |
efd124b9 | 764 | .write_end = exofs_write_end, |
beaec07b BH |
765 | }; |
766 | ||
e8062719 BH |
767 | /****************************************************************************** |
768 | * INODE OPERATIONS | |
769 | *****************************************************************************/ | |
770 | ||
771 | /* | |
772 | * Test whether an inode is a fast symlink. | |
773 | */ | |
774 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
775 | { | |
776 | struct exofs_i_info *oi = exofs_i(inode); | |
777 | ||
778 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
779 | } | |
780 | ||
781 | /* | |
782 | * get_block_t - Fill in a buffer_head | |
783 | * An OSD takes care of block allocation so we just fake an allocation by | |
784 | * putting in the inode's sector_t in the buffer_head. | |
785 | * TODO: What about the case of create==0 and @iblock does not exist in the | |
786 | * object? | |
787 | */ | |
788 | static int exofs_get_block(struct inode *inode, sector_t iblock, | |
789 | struct buffer_head *bh_result, int create) | |
790 | { | |
791 | map_bh(bh_result, inode->i_sb, iblock); | |
792 | return 0; | |
793 | } | |
794 | ||
795 | const struct osd_attr g_attr_logical_length = ATTR_DEF( | |
796 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
797 | ||
06886a5a BH |
798 | static int _do_truncate(struct inode *inode) |
799 | { | |
800 | struct exofs_i_info *oi = exofs_i(inode); | |
801 | loff_t isize = i_size_read(inode); | |
802 | int ret; | |
803 | ||
804 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
805 | ||
806 | nobh_truncate_page(inode->i_mapping, isize, exofs_get_block); | |
807 | ||
808 | ret = exofs_oi_truncate(oi, (u64)isize); | |
809 | EXOFS_DBGMSG("(0x%lx) size=0x%llx\n", inode->i_ino, isize); | |
810 | return ret; | |
811 | } | |
812 | ||
e8062719 BH |
813 | /* |
814 | * Truncate a file to the specified size - all we have to do is set the size | |
815 | * attribute. We make sure the object exists first. | |
816 | */ | |
817 | void exofs_truncate(struct inode *inode) | |
818 | { | |
e8062719 | 819 | struct exofs_i_info *oi = exofs_i(inode); |
e8062719 BH |
820 | int ret; |
821 | ||
822 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) | |
823 | || S_ISLNK(inode->i_mode))) | |
824 | return; | |
825 | if (exofs_inode_is_fast_symlink(inode)) | |
826 | return; | |
827 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
828 | return; | |
e8062719 BH |
829 | |
830 | /* if we are about to truncate an object, and it hasn't been | |
831 | * created yet, wait | |
832 | */ | |
833 | if (unlikely(wait_obj_created(oi))) | |
834 | goto fail; | |
835 | ||
06886a5a | 836 | ret = _do_truncate(inode); |
e8062719 BH |
837 | if (ret) |
838 | goto fail; | |
839 | ||
840 | out: | |
841 | mark_inode_dirty(inode); | |
842 | return; | |
843 | fail: | |
844 | make_bad_inode(inode); | |
845 | goto out; | |
846 | } | |
847 | ||
848 | /* | |
849 | * Set inode attributes - just call generic functions. | |
850 | */ | |
851 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
852 | { | |
853 | struct inode *inode = dentry->d_inode; | |
854 | int error; | |
855 | ||
856 | error = inode_change_ok(inode, iattr); | |
857 | if (error) | |
858 | return error; | |
859 | ||
860 | error = inode_setattr(inode, iattr); | |
861 | return error; | |
862 | } | |
e6af00f1 | 863 | |
d9c740d2 BH |
864 | static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF( |
865 | EXOFS_APAGE_FS_DATA, | |
866 | EXOFS_ATTR_INODE_FILE_LAYOUT, | |
867 | 0); | |
868 | static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF( | |
869 | EXOFS_APAGE_FS_DATA, | |
870 | EXOFS_ATTR_INODE_DIR_LAYOUT, | |
871 | 0); | |
872 | ||
e6af00f1 | 873 | /* |
5d952b83 BH |
874 | * Read the Linux inode info from the OSD, and return it as is. In exofs the |
875 | * inode info is in an application specific page/attribute of the osd-object. | |
e6af00f1 BH |
876 | */ |
877 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
5d952b83 | 878 | struct exofs_fcb *inode) |
e6af00f1 BH |
879 | { |
880 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
d9c740d2 BH |
881 | struct osd_attr attrs[] = { |
882 | [0] = g_attr_inode_data, | |
883 | [1] = g_attr_inode_file_layout, | |
884 | [2] = g_attr_inode_dir_layout, | |
d9c740d2 | 885 | }; |
06886a5a | 886 | struct exofs_io_state *ios; |
d9c740d2 | 887 | struct exofs_on_disk_inode_layout *layout; |
e6af00f1 BH |
888 | int ret; |
889 | ||
45d3abcb | 890 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
891 | if (unlikely(ret)) { |
892 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
893 | return ret; | |
e6af00f1 | 894 | } |
e6af00f1 | 895 | |
06886a5a BH |
896 | ios->obj.id = exofs_oi_objno(oi); |
897 | exofs_make_credential(oi->i_cred, &ios->obj); | |
898 | ios->cred = oi->i_cred; | |
e6af00f1 | 899 | |
d9c740d2 BH |
900 | attrs[1].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); |
901 | attrs[2].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); | |
902 | ||
06886a5a BH |
903 | ios->in_attr = attrs; |
904 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
e6af00f1 | 905 | |
06886a5a | 906 | ret = exofs_sbi_read(ios); |
96391e2b BH |
907 | if (unlikely(ret)) { |
908 | EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n", | |
909 | _LLU(ios->obj.id), ret); | |
910 | memset(inode, 0, sizeof(*inode)); | |
911 | inode->i_mode = 0040000 | (0777 & ~022); | |
912 | /* If object is lost on target we might as well enable it's | |
913 | * delete. | |
914 | */ | |
915 | if ((ret == -ENOENT) || (ret == -EINVAL)) | |
916 | ret = 0; | |
e6af00f1 | 917 | goto out; |
96391e2b | 918 | } |
e6af00f1 | 919 | |
06886a5a | 920 | ret = extract_attr_from_ios(ios, &attrs[0]); |
e6af00f1 | 921 | if (ret) { |
06886a5a | 922 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
e6af00f1 BH |
923 | goto out; |
924 | } | |
06886a5a BH |
925 | WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
926 | memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); | |
e6af00f1 | 927 | |
06886a5a | 928 | ret = extract_attr_from_ios(ios, &attrs[1]); |
d9c740d2 BH |
929 | if (ret) { |
930 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
931 | goto out; | |
932 | } | |
933 | if (attrs[1].len) { | |
934 | layout = attrs[1].val_ptr; | |
935 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
936 | EXOFS_ERR("%s: unsupported files layout %d\n", | |
937 | __func__, layout->gen_func); | |
938 | ret = -ENOTSUPP; | |
939 | goto out; | |
940 | } | |
941 | } | |
942 | ||
943 | ret = extract_attr_from_ios(ios, &attrs[2]); | |
944 | if (ret) { | |
945 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
946 | goto out; | |
947 | } | |
948 | if (attrs[2].len) { | |
949 | layout = attrs[2].val_ptr; | |
950 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
951 | EXOFS_ERR("%s: unsupported meta-data layout %d\n", | |
952 | __func__, layout->gen_func); | |
953 | ret = -ENOTSUPP; | |
954 | goto out; | |
955 | } | |
956 | } | |
957 | ||
e6af00f1 | 958 | out: |
06886a5a | 959 | exofs_put_io_state(ios); |
e6af00f1 BH |
960 | return ret; |
961 | } | |
962 | ||
9cfdc7aa BH |
963 | static void __oi_init(struct exofs_i_info *oi) |
964 | { | |
965 | init_waitqueue_head(&oi->i_wq); | |
966 | oi->i_flags = 0; | |
967 | } | |
e6af00f1 BH |
968 | /* |
969 | * Fill in an inode read from the OSD and set it up for use | |
970 | */ | |
971 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) | |
972 | { | |
973 | struct exofs_i_info *oi; | |
974 | struct exofs_fcb fcb; | |
975 | struct inode *inode; | |
e6af00f1 BH |
976 | int ret; |
977 | ||
978 | inode = iget_locked(sb, ino); | |
979 | if (!inode) | |
980 | return ERR_PTR(-ENOMEM); | |
981 | if (!(inode->i_state & I_NEW)) | |
982 | return inode; | |
983 | oi = exofs_i(inode); | |
9cfdc7aa | 984 | __oi_init(oi); |
e6af00f1 BH |
985 | |
986 | /* read the inode from the osd */ | |
5d952b83 | 987 | ret = exofs_get_inode(sb, oi, &fcb); |
e6af00f1 BH |
988 | if (ret) |
989 | goto bad_inode; | |
990 | ||
e6af00f1 BH |
991 | set_obj_created(oi); |
992 | ||
993 | /* copy stuff from on-disk struct to in-memory struct */ | |
994 | inode->i_mode = le16_to_cpu(fcb.i_mode); | |
995 | inode->i_uid = le32_to_cpu(fcb.i_uid); | |
996 | inode->i_gid = le32_to_cpu(fcb.i_gid); | |
997 | inode->i_nlink = le16_to_cpu(fcb.i_links_count); | |
998 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); | |
999 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); | |
1000 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); | |
1001 | inode->i_ctime.tv_nsec = | |
1002 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; | |
1003 | oi->i_commit_size = le64_to_cpu(fcb.i_size); | |
1004 | i_size_write(inode, oi->i_commit_size); | |
1005 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1006 | inode->i_generation = le32_to_cpu(fcb.i_generation); | |
1007 | ||
e6af00f1 BH |
1008 | oi->i_dir_start_lookup = 0; |
1009 | ||
1010 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { | |
1011 | ret = -ESTALE; | |
1012 | goto bad_inode; | |
1013 | } | |
1014 | ||
1015 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1016 | if (fcb.i_data[0]) | |
1017 | inode->i_rdev = | |
1018 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); | |
1019 | else | |
1020 | inode->i_rdev = | |
1021 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); | |
1022 | } else { | |
1023 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); | |
1024 | } | |
1025 | ||
1026 | if (S_ISREG(inode->i_mode)) { | |
1027 | inode->i_op = &exofs_file_inode_operations; | |
1028 | inode->i_fop = &exofs_file_operations; | |
1029 | inode->i_mapping->a_ops = &exofs_aops; | |
1030 | } else if (S_ISDIR(inode->i_mode)) { | |
1031 | inode->i_op = &exofs_dir_inode_operations; | |
1032 | inode->i_fop = &exofs_dir_operations; | |
1033 | inode->i_mapping->a_ops = &exofs_aops; | |
1034 | } else if (S_ISLNK(inode->i_mode)) { | |
1035 | if (exofs_inode_is_fast_symlink(inode)) | |
1036 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
1037 | else { | |
1038 | inode->i_op = &exofs_symlink_inode_operations; | |
1039 | inode->i_mapping->a_ops = &exofs_aops; | |
1040 | } | |
1041 | } else { | |
1042 | inode->i_op = &exofs_special_inode_operations; | |
1043 | if (fcb.i_data[0]) | |
1044 | init_special_inode(inode, inode->i_mode, | |
1045 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); | |
1046 | else | |
1047 | init_special_inode(inode, inode->i_mode, | |
1048 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); | |
1049 | } | |
1050 | ||
1051 | unlock_new_inode(inode); | |
1052 | return inode; | |
1053 | ||
1054 | bad_inode: | |
1055 | iget_failed(inode); | |
1056 | return ERR_PTR(ret); | |
1057 | } | |
1058 | ||
1059 | int __exofs_wait_obj_created(struct exofs_i_info *oi) | |
1060 | { | |
1061 | if (!obj_created(oi)) { | |
1062 | BUG_ON(!obj_2bcreated(oi)); | |
1063 | wait_event(oi->i_wq, obj_created(oi)); | |
1064 | } | |
1065 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1066 | } | |
1067 | /* | |
1068 | * Callback function from exofs_new_inode(). The important thing is that we | |
1069 | * set the obj_created flag so that other methods know that the object exists on | |
1070 | * the OSD. | |
1071 | */ | |
06886a5a | 1072 | static void create_done(struct exofs_io_state *ios, void *p) |
e6af00f1 BH |
1073 | { |
1074 | struct inode *inode = p; | |
1075 | struct exofs_i_info *oi = exofs_i(inode); | |
1076 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
1077 | int ret; | |
1078 | ||
06886a5a BH |
1079 | ret = exofs_check_io(ios, NULL); |
1080 | exofs_put_io_state(ios); | |
1081 | ||
e6af00f1 BH |
1082 | atomic_dec(&sbi->s_curr_pending); |
1083 | ||
1084 | if (unlikely(ret)) { | |
1085 | EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx", | |
45d3abcb | 1086 | _LLU(exofs_oi_objno(oi)), _LLU(sbi->layout.s_pid)); |
06886a5a BH |
1087 | /*TODO: When FS is corrupted creation can fail, object already |
1088 | * exist. Get rid of this asynchronous creation, if exist | |
1089 | * increment the obj counter and try the next object. Until we | |
1090 | * succeed. All these dangling objects will be made into lost | |
1091 | * files by chkfs.exofs | |
1092 | */ | |
1093 | } | |
1094 | ||
1095 | set_obj_created(oi); | |
e6af00f1 BH |
1096 | |
1097 | atomic_dec(&inode->i_count); | |
1098 | wake_up(&oi->i_wq); | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * Set up a new inode and create an object for it on the OSD | |
1103 | */ | |
1104 | struct inode *exofs_new_inode(struct inode *dir, int mode) | |
1105 | { | |
1106 | struct super_block *sb; | |
1107 | struct inode *inode; | |
1108 | struct exofs_i_info *oi; | |
1109 | struct exofs_sb_info *sbi; | |
06886a5a | 1110 | struct exofs_io_state *ios; |
e6af00f1 BH |
1111 | int ret; |
1112 | ||
1113 | sb = dir->i_sb; | |
1114 | inode = new_inode(sb); | |
1115 | if (!inode) | |
1116 | return ERR_PTR(-ENOMEM); | |
1117 | ||
1118 | oi = exofs_i(inode); | |
9cfdc7aa | 1119 | __oi_init(oi); |
e6af00f1 | 1120 | |
e6af00f1 BH |
1121 | set_obj_2bcreated(oi); |
1122 | ||
1123 | sbi = sb->s_fs_info; | |
1124 | ||
1125 | sb->s_dirt = 1; | |
1126 | inode->i_uid = current->cred->fsuid; | |
1127 | if (dir->i_mode & S_ISGID) { | |
1128 | inode->i_gid = dir->i_gid; | |
1129 | if (S_ISDIR(mode)) | |
1130 | mode |= S_ISGID; | |
1131 | } else { | |
1132 | inode->i_gid = current->cred->fsgid; | |
1133 | } | |
1134 | inode->i_mode = mode; | |
1135 | ||
1136 | inode->i_ino = sbi->s_nextid++; | |
1137 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1138 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1139 | oi->i_commit_size = inode->i_size = 0; | |
1140 | spin_lock(&sbi->s_next_gen_lock); | |
1141 | inode->i_generation = sbi->s_next_generation++; | |
1142 | spin_unlock(&sbi->s_next_gen_lock); | |
1143 | insert_inode_hash(inode); | |
1144 | ||
1145 | mark_inode_dirty(inode); | |
1146 | ||
45d3abcb | 1147 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1148 | if (unlikely(ret)) { |
1149 | EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n"); | |
1150 | return ERR_PTR(ret); | |
e6af00f1 BH |
1151 | } |
1152 | ||
06886a5a BH |
1153 | ios->obj.id = exofs_oi_objno(oi); |
1154 | exofs_make_credential(oi->i_cred, &ios->obj); | |
e6af00f1 BH |
1155 | |
1156 | /* increment the refcount so that the inode will still be around when we | |
1157 | * reach the callback | |
1158 | */ | |
1159 | atomic_inc(&inode->i_count); | |
1160 | ||
06886a5a BH |
1161 | ios->done = create_done; |
1162 | ios->private = inode; | |
1163 | ios->cred = oi->i_cred; | |
1164 | ret = exofs_sbi_create(ios); | |
e6af00f1 BH |
1165 | if (ret) { |
1166 | atomic_dec(&inode->i_count); | |
06886a5a BH |
1167 | exofs_put_io_state(ios); |
1168 | return ERR_PTR(ret); | |
e6af00f1 BH |
1169 | } |
1170 | atomic_inc(&sbi->s_curr_pending); | |
1171 | ||
1172 | return inode; | |
1173 | } | |
ba9e5e98 BH |
1174 | |
1175 | /* | |
1176 | * struct to pass two arguments to update_inode's callback | |
1177 | */ | |
1178 | struct updatei_args { | |
1179 | struct exofs_sb_info *sbi; | |
1180 | struct exofs_fcb fcb; | |
1181 | }; | |
1182 | ||
1183 | /* | |
1184 | * Callback function from exofs_update_inode(). | |
1185 | */ | |
06886a5a | 1186 | static void updatei_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 BH |
1187 | { |
1188 | struct updatei_args *args = p; | |
1189 | ||
06886a5a | 1190 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1191 | |
1192 | atomic_dec(&args->sbi->s_curr_pending); | |
1193 | ||
1194 | kfree(args); | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * Write the inode to the OSD. Just fill up the struct, and set the attribute | |
1199 | * synchronously or asynchronously depending on the do_sync flag. | |
1200 | */ | |
1201 | static int exofs_update_inode(struct inode *inode, int do_sync) | |
1202 | { | |
1203 | struct exofs_i_info *oi = exofs_i(inode); | |
1204 | struct super_block *sb = inode->i_sb; | |
1205 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1206 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1207 | struct osd_attr attr; |
1208 | struct exofs_fcb *fcb; | |
1209 | struct updatei_args *args; | |
1210 | int ret; | |
1211 | ||
1212 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
34ce4e7c BH |
1213 | if (!args) { |
1214 | EXOFS_DBGMSG("Faild kzalloc of args\n"); | |
ba9e5e98 | 1215 | return -ENOMEM; |
34ce4e7c | 1216 | } |
ba9e5e98 BH |
1217 | |
1218 | fcb = &args->fcb; | |
1219 | ||
1220 | fcb->i_mode = cpu_to_le16(inode->i_mode); | |
1221 | fcb->i_uid = cpu_to_le32(inode->i_uid); | |
1222 | fcb->i_gid = cpu_to_le32(inode->i_gid); | |
1223 | fcb->i_links_count = cpu_to_le16(inode->i_nlink); | |
1224 | fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
1225 | fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
1226 | fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
1227 | oi->i_commit_size = i_size_read(inode); | |
1228 | fcb->i_size = cpu_to_le64(oi->i_commit_size); | |
1229 | fcb->i_generation = cpu_to_le32(inode->i_generation); | |
1230 | ||
1231 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1232 | if (old_valid_dev(inode->i_rdev)) { | |
1233 | fcb->i_data[0] = | |
1234 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
1235 | fcb->i_data[1] = 0; | |
1236 | } else { | |
1237 | fcb->i_data[0] = 0; | |
1238 | fcb->i_data[1] = | |
1239 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
1240 | fcb->i_data[2] = 0; | |
1241 | } | |
1242 | } else | |
1243 | memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); | |
1244 | ||
45d3abcb | 1245 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1246 | if (unlikely(ret)) { |
1247 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
ba9e5e98 BH |
1248 | goto free_args; |
1249 | } | |
1250 | ||
ba9e5e98 BH |
1251 | attr = g_attr_inode_data; |
1252 | attr.val_ptr = fcb; | |
06886a5a BH |
1253 | ios->out_attr_len = 1; |
1254 | ios->out_attr = &attr; | |
ba9e5e98 BH |
1255 | |
1256 | if (!obj_created(oi)) { | |
1257 | EXOFS_DBGMSG("!obj_created\n"); | |
1258 | BUG_ON(!obj_2bcreated(oi)); | |
1259 | wait_event(oi->i_wq, obj_created(oi)); | |
1260 | EXOFS_DBGMSG("wait_event done\n"); | |
1261 | } | |
1262 | ||
06886a5a | 1263 | if (!do_sync) { |
ba9e5e98 | 1264 | args->sbi = sbi; |
06886a5a BH |
1265 | ios->done = updatei_done; |
1266 | ios->private = args; | |
1267 | } | |
ba9e5e98 | 1268 | |
06886a5a BH |
1269 | ret = exofs_oi_write(oi, ios); |
1270 | if (!do_sync && !ret) { | |
ba9e5e98 BH |
1271 | atomic_inc(&sbi->s_curr_pending); |
1272 | goto out; /* deallocation in updatei_done */ | |
1273 | } | |
1274 | ||
06886a5a | 1275 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1276 | free_args: |
1277 | kfree(args); | |
1278 | out: | |
34ce4e7c BH |
1279 | EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n", |
1280 | inode->i_ino, do_sync, ret); | |
ba9e5e98 BH |
1281 | return ret; |
1282 | } | |
1283 | ||
a9185b41 | 1284 | int exofs_write_inode(struct inode *inode, struct writeback_control *wbc) |
ba9e5e98 | 1285 | { |
a9185b41 | 1286 | return exofs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
ba9e5e98 BH |
1287 | } |
1288 | ||
1289 | /* | |
1290 | * Callback function from exofs_delete_inode() - don't have much cleaning up to | |
1291 | * do. | |
1292 | */ | |
06886a5a | 1293 | static void delete_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 | 1294 | { |
06886a5a BH |
1295 | struct exofs_sb_info *sbi = p; |
1296 | ||
1297 | exofs_put_io_state(ios); | |
1298 | ||
ba9e5e98 BH |
1299 | atomic_dec(&sbi->s_curr_pending); |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Called when the refcount of an inode reaches zero. We remove the object | |
1304 | * from the OSD here. We make sure the object was created before we try and | |
1305 | * delete it. | |
1306 | */ | |
1307 | void exofs_delete_inode(struct inode *inode) | |
1308 | { | |
1309 | struct exofs_i_info *oi = exofs_i(inode); | |
1310 | struct super_block *sb = inode->i_sb; | |
1311 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1312 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1313 | int ret; |
1314 | ||
1315 | truncate_inode_pages(&inode->i_data, 0); | |
1316 | ||
1317 | if (is_bad_inode(inode)) | |
1318 | goto no_delete; | |
1319 | ||
1320 | mark_inode_dirty(inode); | |
1321 | exofs_update_inode(inode, inode_needs_sync(inode)); | |
1322 | ||
1323 | inode->i_size = 0; | |
1324 | if (inode->i_blocks) | |
1325 | exofs_truncate(inode); | |
1326 | ||
1327 | clear_inode(inode); | |
1328 | ||
45d3abcb | 1329 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1330 | if (unlikely(ret)) { |
1331 | EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__); | |
ba9e5e98 BH |
1332 | return; |
1333 | } | |
1334 | ||
ba9e5e98 BH |
1335 | /* if we are deleting an obj that hasn't been created yet, wait */ |
1336 | if (!obj_created(oi)) { | |
1337 | BUG_ON(!obj_2bcreated(oi)); | |
1338 | wait_event(oi->i_wq, obj_created(oi)); | |
1339 | } | |
1340 | ||
06886a5a BH |
1341 | ios->obj.id = exofs_oi_objno(oi); |
1342 | ios->done = delete_done; | |
1343 | ios->private = sbi; | |
1344 | ios->cred = oi->i_cred; | |
1345 | ret = exofs_sbi_remove(ios); | |
ba9e5e98 | 1346 | if (ret) { |
06886a5a BH |
1347 | EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__); |
1348 | exofs_put_io_state(ios); | |
ba9e5e98 BH |
1349 | return; |
1350 | } | |
1351 | atomic_inc(&sbi->s_curr_pending); | |
1352 | ||
1353 | return; | |
1354 | ||
1355 | no_delete: | |
1356 | clear_inode(inode); | |
1357 | } |